Fur sewing machine



Oct. 11, 1938. c. BONIS FUR SEWING MACHINE Filed April 50, 1938 3 Sheets-Sheet l INVENTOR. Caesar Eon/'5 ATTORNEY.

Oct. 11, 1938. c. BONIS FUR SEWING MACHINE Filed April 30, 1958 5 Sheets-Sheet 2 INVENTOR.

Caesar Bon/ BY A RNE TTO Oct. 11, 1938. c. BONIS FUR SEWING MACHINE Filed April 30, 1938 5 Sheets-Sheet s (66750!" Ban/l5 ATTORNEY.

Patented Oct. 11, 1938 .UNITED STATES PATENT OFFICE FUItSEWING MACHINE Caesar Bonis, Brooklyn, N. Y. Application April so, 1938, Serial No. 205,177

7 Claims. (c 112-15? This inventionrelates to fur sewing machines and more particularly to the needle bar and looper frame mechanisms a ndhas'for 'one of its objects the provision of means for'eliminating all lost motion in said mechanisms due to wear, such wear atjthe present time causing breakage of the needle and also slip stitching. I

Another object of the invention is the provision of a needle bar-yoke or carrier having a V shaped slideway at the bottom thereof'which is in sliding engagement witha rod, so as to prop erly guide the said yoke in its to and fro movement and prevent any'sidewise tilting or swinging thereof, such tilting carrying the needle bar and needle out of proper alinement with the needle guard. or plate and causes the needle to strike the needle .guard and become bent or broken.

Afurther object of the invention is the provision of such a combination of needlebar-yoke and lower mounting in which the mounting is adjustable with reference to theyoke.

A still further object of the invention is the provision of a ball joint for connecting the looper frame rocker to the looper frame to prevent lost motion of the said looper frame due to wear. Such lost motion is objectionable as the looper in case there is lost motion present, may at such times raise or lift up the needle and break same and will often misaline the needle with the loop,

causing slip stitches.

Yet another object is the provision of a split bearing in the looper frame where the ball joint connects same with the rocker, together with means for tightening same about the ball joint to take up wear when such wear occurs.

Another object is to produce a device of the character described in which the maximum simplicity of construction and operation is secured.

Other objects and advantages will appear as the nature of the improvements is better understood, the invention consisting substantially in the novel arrangement and co-relation of parts here- 45 in fully described and illustrated in the accompanying drawings, wherein similar reference characters are used to describe corresponding parts throughout the several views, and then finally pointed out and specifically defined and in- 50 dicated in the appended claims.

The disclosure made the basis of exemplifying the present inventive concept suggests a practical embodiment thereof, but the invention is not to be and the latter, therefore, is to be understood from an illustrativa'rather than a restrictive stand: point.

In the accompanying drawings: 4

Figure 1 is aside view partly in section of a fur sewing machine embodying myinvention, "only '5 such portion of the general mechanism being shown as is directly connected with my improvements;

' Fig. 2 is a fragmental top plan view thereof;

Fig. 3 is a fragmental rear view of the machine 10 showing the manner of mounting the lower guide or rod upon which the needle bar yoke slides;

Fig. 4 is a fragmental sectional view taken on line 4-4 Fig. 1;

Fig. 5 is a sectional view taken on line 5-5 Fig. 15 4, and showing the looper frame and the operating mechanism therefor;

I Fig. 6 is a fragmental front elevation of the looper frame and rocker connection; and

Fig. 7 is a modified form of the needle bar-yoke 20 slide mounting.

In the fur sewing machines now commonly used the needle bar yoke is carried at its upper end on the needle barand depends upon its contact with the driving eccentric and other moving parts for 25 proper alinement. Inasmuch as the said parts are subjected to hard wear, lost motion between the said parts results after a short time causing wobbling or sidewise movement of the needle bar and needle, said movement being great enough to 30 cause the needle to strike the needle plate or guard and become bent or broken. To overcome this undesirable feature, I have provided the needle bar-yoke with a V shaped cut at the bottom thereof which is in constant sliding engagement with a rod carried upon a plate which is adjustably mounted on the machine frame.

The looper frame in such machines slides at its upper rear forked end upon a pin or stud and is connected at its lower front end to a rocking mechanism comprising a pivotally mounted rocker having a stud which fits into the looper frame. Due to wear, the connection between the stud and frame becomes loose, with the result that the looper at times will come in contact with the needle, lift same up, bend or break same, and cause a misalinement of the needle and thread loop, thus producing a slip stitch. This objectionable feature I overcome by providing a ball joint connection between the rocker and looper frame, such connection having considerably less wear than the stud connection above referred to. I further provide means for taking up the wear in the said connection by splitting the looper frame at the said connection and by providing a screw and nut to tighten the bearing about the ball joint.

Referring now to the drawings in detail Ill indicates the frame of the machine in which is rotatably mounted a drive shaft ll upon which is secured an eccentric l2 in engagement with the vertical surfaces l3 and H of a yoke I5 carried by a needle bar l6 slidingly mounted in the front and rear walls of the frame Ill. The forward end of the needle bar I 6 is provided with an extension I! in the lower end of which there is carried the needle It for sewing the material fed between the discs l9 and 2b. The said discs are of the conventional type and are driven in the usual manner by a driving mechanism not shown, as the said driving mechanism forms no part of the present invention. A needle plate or guard It is secured to the supporting stud 22 of the disc l9 by a screw 23.

The lower end of the yoke l 5 is provided with a wall 26 (see Figs. 1 and 4) in which there is cut a V shaped groove 25 which is in sliding engagement with a similarly shaped top 26 of a rod 2'5 supported at the rear thereof in a plate 28 by means of a nut 29 on the threaded end'3ll of the rod 2'5. The plate 28 is secured to the rear wall of the frame in by means of screws 3i whose diameter is somewhat smaller than the clearance holes 32 to permit of vertical and horizontal adjustment of the rod 27 with respect to they shape groove in the yoke IE to take-up any wear between the said parts. I

Slidably mounted between ears 35 at the front of the machine frame It and ears 36 at the rear of the said frame is a looper frame 3?! which at the rear thereof is provided with a bifurcated end 38 in sliding engagement with a stud 39 carried by the ears 258. A looper 40 is swingably mounted in the looper frame 3'7 and is operated for loop forming in the usual manner by a cam fit having a cam groove 42 in which rides a cam roller 43 carried on an arm 43 secured to the looper dil. (See Figs. 1, 2, 4 and 5).

The lower forward end of the looper frame is provided with a bearing 45 in which there is clampingly maintained a bushing 48 forming a part of a ball joint 87. Besides the said bushing 46 the ball joint comprises a ball portion 48 which is rotatablein the bushing 46, and a stud portion 4d which is screw threadedly maintained and riveted into the rocker plate or arm 50. A slotted head Si is provided at one end of the ball 48 so that it may be screwed into the rocker plate. The rocker plate 50 is secured to a shaft 52 which is swingably mounted in a bracket 53 secured to the front wall of the machine frame IE1. The looper frame is moved to and fro by means of an eccentric 54' in engagement with a bifurcated lower portion 55 of the said looper frame. In order that any play between the ball 48 and the bushing 46 may be taken up, the looper frame is provided with a split 56 at the bearing 45 and a screw 51 and nut 58 are utilized to tighten the said bushing about the ball when wear occurs.

In Fig. 7, I have shown a modified form of my invention wherein instead of using the V shaped rod 21, I use a cylindrical or round rod 60 for slidingly mounting the needle bar-yoke l5.

From the foregoing, it will be seen that I have provided means in both the needle bar-yoke and the looper frame constructions which will eliminate lost motion in the said elements and thus tend to prevent the breaking or bending of theneedle and at the same time to also prevent slip stitches.

Having described by invention what I claim as new and desire to secure by Letters Patent is:

1. In a sewing machine for fur and the like, having material feeding discs; a needle bar, a needle bar-yoke carried by the said needle bar, a needle guard on one of the said discs, and a main drive shaft with an eccentric for operating the needle bar-yoke to move same backward and forward, a V shaped slideway at the bottom of the said needle bar-yoke, a rod in engagement with the V shaped slideway forming a lower support for the said yoke, and a plate for adjustably supporting said rod.

2. In a sewing machine for fur and the like,

having material feeding discs, a frame, a needle bar, a needle bar-yoke carried by the said needle bar, a needle guard on one of the said discs, and a main drive shaft with an eccentric for operating the needle bar yoke to move same backward and forward, a V shaped slideway at the bottom of the said needle bar-yoke, a rod in engagement with the V shaped slideway forming a lower support for the said yoke and a plate for supporting the said rod, the said plate being adjustable on the machine frame.

3. In a sewing machine for fur and the like, having material feeding discs, a frame, a needle bar, a needle bar-yoke carried by the said needle bar, a needle guard on one of the said discs, and a main drive shaft with an eccentric for operating the needle bar yoke to move same backward and forward, a V shaped slidewayat the bottom of the said needle bar-yoke, a rod in engagement with the V shaped slideway forming a lower sup-= port of the said yoke, a plate for supporting the said rod, the said plate having an upper and a lower hole, and screws of smaller diameter than the plate holes for adjustably securing the plate to the machine frame.

ii. In a sewing machine for fur and the like, having a looper frame, a looper carried by the said frame, and a main drive shaft with a cam and an eccentric for operating the said looper and frame, a rocker pivotally mounted at the front of the machine, a split bearing at the lower front end of the looper frame, a ball joint connecting the said rocker to the split bearing, the said ball joint comprising a stud secured to the rocker at one end, a ball portion at the opposite end, a

bushing rotatably mounted on the ball portion and fitting into the bearing, and screw and nut means for tightening the bearing to press the bushing closely about the ball.

5. In a sewing machine for fur and the like, having material feeding discs, a needle bar, a needle baryoke carried by the needle bar, a needle guard on one of the said discs, a looper frame, a looper carried by the said looper frame, and a main shaft with a suitable cam and eccentries for operating the respective parts, a V shaped groove at the bottom of the needle bar yoke, a rod adjustably mounted for sliding engagement with the said V shaped groove, a rocker pivotally mounted at the front of the machine, a split bearing at the lower front end of the looper frame, a ball joint connecting the said rocker to the said split bearing, and means for tightening the said bearing about the said ball joint.

6. In a sewing machine for fur and the like, having material feeding discs, a needle bar, a needle bar yoke carried by the needle bar, a needle guard on one of the said discs, a looper frame, a looper carried by the said looper frame, and amain shaft with a suitable cam and eccentries for operating the respective parts, a V shaped groove at the bottom of the needle bar yoke, a rod adjustably mounted for sliding engagement with the said V shaped groove, a rocker pivotally mounted at the front of the machine, a split bearing at the lower front end of the looper frame, a ball joint connecting the said rocker to the said split bearing, the said ball joint comprising a. stud secured to the rocker at one end, a ball portion at the opposite end, a bushing rotatably mounted on the ball portion and fitting into the bearing, and screw and nut means for tightening the bearing to press the bushing closely about the ball.

7. In a sewing machine for fur and the like, having material feeding discs, a needle bar, a needle bar yoke carried by the said needle bar, a needle guard on one of the said discs, and a main drive shaft with an eccentric for operating the needle bar yoke to move same backward and forward, a V shaped slideway at the bottom of the said needle bar-yoke, a rod adjustably mounted with respect to the V shaped groove, and a V shaped upper portion on the said rod for sliding engagement with the V shaped groove in the yoke.

CAESAR BONIS. 

